...default allocator allocates a page-worth of nodes, which are assigned in order from the...

...library, mainly by cleaning up the AST nodes by moving the semantic elements in more...

...best?  It "works" by operating on AST nodes as if they were values, and is...

...or AST nodes. This will make source code refactorings difficult/impossible

* Some AST nodes don...

...modify the meaning of existing nodes or indeed introduce new nodes, cannot be used.
As...

...I understand what you mean by "semantically processed nodes". The other question remains unanswered, though.

...this problem related to the frontend only?

What do you mean by "semantically processed nodes"?

...expensive.
If you have completely semantically processed nodes, linking them

What exactly do you mean...

...just types to *all* kinds of AST nodes (FunctionBuilder, ExpressionBuilder, etc.), what you end up...

...for the first overload

  Template declarations are nodes in a linked list of overloads.
  Returning...